Provides option settings management that goes
beyond R's default 'options' function. With this package, users can define
their own option settings manager holding option names, default values and
(if so desired) ranges or sets of allowed option values that will be
automatically checked. Settings can then be retrieved, altered and reset
to defaults with ease. For R programmers and package developers it offers
cloning and merging functionality which allows for conveniently defining
global and local options, possibly in a multilevel options hierarchy. See
the package vignette for some examples concerning functions, S4 classes,
and reference classes. There are convenience functions to reset par()
and options() to their 'factory defaults'.